Hi Nordic
When I use JLINK to burn the firmware to the nRF52832 chip in the device, some devices cannot be programmed or cannot be programmed again after burning once
The following experiments have been done:
- The nRF52832 chip on a normal device can be programmed repeatedly
- Solder the nRF52832 chip of the problematic device to the normal device, it cannot be programmed
- Solder the nRF52832 chip of the normal device to the problematic device, and it can be programmed in the first few times, but it cannot be programmed after a long time of power-on, and the nRF52832 chip can not be programmed after soldering the it back to the normal device again.
- Use the 3.3V power supply of the problem device to power the nRF52832 chip of the normal device, and it can be programmed normally
- There is a faulty device that cannot be programmed again after being programmed for the first time, but the chip can work normally
Entering the 'nrfjprog --recover' command, and use an oscilloscope to test the SWDIO and SWDCLK pins of the abnormal device. The photos are as follows, yellow is SWDIO, green is SWKCLK
The SWDIO and SWDCLK pins of a normal device, the levels are as follows
The SWDIO and SWDCLK pins of a normal device, the levels are as follows
layout is as follow
schematic design is as follow
nRF52832 part
core board part
5V to 3.3V power design
What could be the reason for this problem? Please help.
